Add wait in TestAccAppEngineStandardAppVersion_update test to avoid…

… 'API has not been used in project' error (GoogleCloudPlatform#10076)

* Add wait in acc test to avoid 'API has not been used in project' error

* Add external provider `time`

* Fix defect when referencing google_project resource

mmv1/third_party/terraform/services/appengine/resource_app_engine_standard_app_version_test.go

@@ -20,7 +20,10 @@ func TestAccAppEngineStandardAppVersion_update(t *testing.T) {
 	acctest.VcrTest(t, resource.TestCase{
 		PreCheck:                 func() { acctest.AccTestPreCheck(t) },
 		ProtoV5ProviderFactories: acctest.ProtoV5ProviderFactories(t),
-		CheckDestroy:             testAccCheckAppEngineStandardAppVersionDestroyProducer(t),
+		ExternalProviders: map[string]resource.ExternalProvider{
+			"time": {},
+		},
+		CheckDestroy: testAccCheckAppEngineStandardAppVersionDestroyProducer(t),
 		Steps: []resource.TestStep{
 			{
 				Config: testAccAppEngineStandardAppVersion_python(context),
@@ -161,11 +164,20 @@ resource "google_project_service" "project" {
   disable_dependent_services = false
 }
 
+resource "time_sleep" "wait_60_seconds" {
+  depends_on = [google_project.my_project]
+
+  create_duration = "60s"
+}
+
 resource "google_project_service" "vpcaccess_api" {
   project = google_project.my_project.project_id
   service = "vpcaccess.googleapis.com"
 
   disable_dependent_services = false
+
+  # Needed for CI tests for permissions to propagate, should not be needed for actual usage
+  depends_on = [time_sleep.wait_60_seconds]
 }
 
 resource "google_vpc_access_connector" "bar" {